The resulting BMEP/MAP is an indication of VE and correct ignition timing.
In my curve above, the plot from 4000-7000 is VE
The reduced VE below 4000 RPM is due to the the wastegate being closed, TIP is higher to accelerate the turbo shaft.

looking at the BMEP/MAP curve, I can see that my VVT produces a broader torque band, and better breathing in the spoolup region (2500-4000 RPM). Or perhaps the ignition timing in the 3071 setup during spoolup, can be improved.

In the 2500-4000 RPM region, because boost is rising, one can't directly compare torque outputs between 2 setups with different boost curves. BMEP/MAP allows you to do so.

The following link explains BMEP. A bit lost in there is that BMEP is exactly proportional to Torque divided by Displacement (the units I like to use personally is ft-lbs per L), or simply Torque per Liter for a n/a motor at sea level. For a boosted engine, BMEP/MAP is the equivalent figure of merit, or ft-lbs per L per atmo of MAP.

I'm trying to get the Virtual Dyno guy to at least add text output of calculated torque so I can drill down to this for street spark tuning. We'll see.

This seems to be the first reasonably easy way to create some sort of street spark tuning. I've been waiting for you and the Virtual Dyno guy to get this data output problem in place before I start messing with it.